I have experienced pruritus mainly to the crown since I was a teenager. I have used all types of products, prescription and OTC, including Nazoral, Neutrogena products, etc. The only one that I have found to be efficacious has been Neutrogena T-Gel. It stinks (literally), it produces sun sensitivity, and it dries my hair. Do you know if continuous daily use of this product will impact my health? I have heard that chronic exposure to coal tar may cause cancer. I do appreciate your professionalism and your desire to help those of us who have issues with the prospect of balding.
You might try hydrocortizone cream (0.5%) applied two or three times a week to the scalp. It should not be used more frequently than that, because it could be absorbed with high doses. If you keep its use down to two or three applications directly to the area every 12 hours for 2-3 applications, you might find that the problem will disappear. What you are calling Pruritus may actually be other conditions, and a dermatologist might give you the diagnosis you need.